Safety gas-burner



Y(No Model.)

A. P. PRECHETTB &P. M. DUPUIS.

SAFETY GAS BURNER.

Patented Sept. 9, 1890.

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W/TNESSES:

UNITED STATES PATENT OEEICE.

ATHANASE P. FREOHETTE AND PETER M. DUPUIS, OF CARSON CITY,

- NEVADA.

SAFETY GAS-Bu RN ER.

SPECIFICATION forming partlof Letters Patent No. 436,230, dated September 9, 1890.

Application tiled April 9 1890. Serial No. 347,207. (No model.)

`Nevada, have invented a new and useful Safety Gas-Burner, of which the following is a full, clear, and exact description.

The object of this invention is to provide a gas-burner with means for automatic closure of the valve which supplies gas to the burnertip when from any cause the flame is extinguished and the pressure of gas continues in the burner-body.

' To this end our invention consists in the construction and combination of parts, as is hereinafter described, and indicated in the claim. Y

Reference is to be had to the accompanying drawings, forming a part of this speciiication, in which similar letters of reference indicate corresponding parts in all the iigures.

Figure lis an axially sectional elevation of the burner, showing the parts adjusted to shut gas oif from the burner. Fig. 2 is an axial longitudinal section of the burner with interior parts adj usted to supply gas to the burner-tip. Fig. 3 is an inverted plan view in section taken on the line 3 3 in Fig. l, the safety-valve in the burner being closed. Fig. 4 is a detached view of a compound thermostatic ring used in the burner, and Fig. 5 is a broken and detached detail.

The burner body or shell A is substantially hemispherical in form, having a depending cylindrical hubB, from one side ot which an integral socket c projects, the portion B having an axial orifice formed through it which intersects the interior of the shell A, said aperture being reamed to taper from the lower end to receive a plug b of corresponding form which is ground to a gas-tight fit.

The plug h is furnished with -a T-head below to aord a finger-grip wherewith to revolve it, and an axial perforation cis formed from its upper end to a point where it intersects a transverse hole c', which is axially coincident with the central aperture of the socket projection a, the latter being internally threaded to receive a gas-supply pipe. (Not Shown.)

T he plug b is retained in place by a washer d and set-nut d', which bears on the washer that in turn rests partly upon ashoulder or oiset on the plug-body produced by its reduction to form a bolt end (Z2. A portionof the washer extending laterally is seated on the' true surface Vof an.annular flat rib produced on the bottom of the shell A within it and around the extended aperture of the hub B, which intersects the shell, as before stated.

- At the upper edge of the shell A its inner surface is threaded for the introduction of a mating threaded depending flange formed in-4 tegral with the burner-cap A', that is adapted to screw into the shell until the bead e. engages the edge of the shell with a gas-tight joint. n

Above the bead e the wall of the cap A' projects a short distance and terminates in a being faced off true on its lower side becomes:

a valve-seat, whereon the disk-valve 't' is made to impinge and form a tight joint by its attachment upon 'the upper edge of aV swinging bar k, that is pivoted at one end between two depending parallel ears k', form ed on a laterally-projected arm k2, which is a portion of the head g2 and extends from the head in the same horizontal plane.

The swinging bar lois so jointed to the ears k' that when it is horizontal the valve t' will bear fiat upon its seat gas-tight.

Integral with the pivoted end of the swinging bar 7c a depending arm m is formed at right angles thereto and projects downwardly a proper distance to have a lateral engagement with the toe m', that is an integral diagonally-upward projection from the washerplate d',V these pieces being so formed and wall IOS)

proportioned that when the washer d', which is clamped on the end of the plug b, is revolved thereby the end of the toe m' will impinge on and rock the arm m outwardly and the swinging bar l.: downwardly. I

A strong plate-spring m3 is affixed by one end to the outer end of the projecting arm k2. Its lower end bearing on the arm m returns said arm to a vertical position, when thearm is free, and consequently closes thek valve t'.

Between the concentric walls formed on the cap-piece A', as before explained, two rings n fn.' are seated on the flat wall of the cap-piece, the inner and heavier ring being made of brass and the outer enveloping; ring of steel or iron.

. T-he rings n n' are severed, as shown at n2 'n3 in Fig. 4, and are of such a relative diameter vto the inner diameter of the cap A', to which they are fastened by a screw at 0, that the latter holds them closely embraced.

Two dowel-pins 0 02 are inserted laterally in the rings near their several ends on each side of the cuts, so as to bind them together. Consequently when the rings are subjected to heat evolved by combustion of gas and radiant projection of the same against the wall of the cap A', they will, by dilerential expansion, separate at the ends, so that the upwardlyprojecting small pins p p', which are respectively located on the outer opposed ends of the outer steel and inner brass rings and are radially in line when the rings are cold, will be moved out of line, the pin o2 moving in a direction from the opposite end of the bar n'.

A iiat bar r is provided, which is curved edgewise to conform to the curvature of the ring n', against which it bears, a portion near one end being widened to permit of two perforations being made in the plate near said end of such a size vand distance apartas will adapt them to tit closely the pins p p', as the curved bar r is required to work'freely on the ring it rests against. A finger-spring s is made to bear lightly upon its flat lower surface, said spring being` attached to the brass ring 'n' by a screw inserted through the end that is not in contact with the bar r. When the parts of the burner are cold, the free end of the at bar r should be projected slightly further away from the burner-shell than `is its engaged opposite end.

Upon the free end of the swinging bar 7c a straight spring s', made of thin steel plate or. hard brass, is attached by one of its ends, becoming in effect alaterally elastic but edgewise rigid extension of said bar.

From the inner side of the cap A' a depending post t is projected downwardly and bent slightly inward. The position of this flattened post is opposite the end oi the inelastic portion of the swinging bar k, and to operate efficiently the spring s should align with the center of the post t and rest 'on its lower end, when the revolution of the plug b, and the consequent engagement of the toe m' with the arm m, depresses the swinging bar Za a proper distancev to open the safetyvalve i.

On the free end of the laterally-curved bar ra ratchet-cut curved extension-bar r' is pivotally attached free to vibrate vertically, said connection of parts being shown in Fig. 5.

The teeth cut in the lower edge of the laterally-curved extension-bar r are made to engage the top edge of the spring-piece s', over which they will slide freely when the thermostatic rings n 'n' are being unequally lengthened by heat. It is evident when the burner is made hot, and the rings n 'n' also, their consequent lengthening will swing the free end of the bar r toward the side of the cap A', which movement will draw the `piece r' in like manner over the edge of the elastic spring-piece s', the ratchet-cnt bar fr' being held in engagement with the spring-piece s' by a weighty ball r2 attached to its free end.

In operation the gas is introduced into the shell A by opening the plug-valve b, which will cause the spring end s to assume a position on the free lower end of the depending post t, as represented in Fig. 2, in which the arm mand toe m are shown in contact, which is necessary to vibrate the barkand open the valve vl. It should, however, be specified that subsequently the toe and arm are slightly separated by a further revoluble movement of the toe m', so that the valve t' is retained in open adjustment solely by the resting engagement of the edge of the spring-extension s with the post t, as has been fully explained, the position o 'I' the spring end being shown as aside of said post when the valve i is closed.

' (See Figs. 1 'and 3.) The act of opening the gas-passage through theplugb depresses the end of the spring-piece s and permits it to straighten by reason of its elasticity and as- ICO sume contact with the end of the post t, as

stated, and it will so remain until the plug b is again turned to extinguish the gas by cutting off supply to the shell A Aor until the iiame at the gas-tip is accidentally extinguished with the plug b in an open position.

When the sudden extinguishment of the gas at the burner-tip is produced from any cause while the pressure of gas is in the shell A or by reason of a temporary obstruction to gas-supply that extingnishes the burning gas and afterward refills the burner-shell so as to escape from the tip unlighted, the peculiar construction ot the burner mechanism prevents such a dangerous escape of the gas, as the heating of the shell and rings/nn causes a lateral vibration of the ratchet-cut extensionbar r', which may Afreely move over the spring end piece s without dislodging it when the movement is in the direction indicated by an arrow in Fig. 3, which takes place as the burner heats up; but when the iiame is extinguished there is a reversal of movement of the bar fr' due to cooling of the shell A and rings n n', and this will cause the ratchet-bar r' to push the spring-piece s'trom its position on the post t, so that the plate- IIO spring m3 may close the Valve 'L' and prevent an escape of gas at the burner-tip. may be relighted by a revolution of the plugvalve b, which movement will reset the diskvalve in open adjustment. 1

Owing to the extent of heating-surface afforded to the shell A and contiguity of the flame thereto, the gas Within the shell will be heated considerably, and in consequence expand, so that more perfect combustion will result in use of this burner than can be eected in a gas-burner of ordinary form.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

In a safety gas-burner, the combination,

The gas 

